﻿jQuery.extend({
  createUploadIframe: function(id, uri)
  {
    //create frame
    var frameId = 'jUploadFrame' + id;
    var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
    if(window.ActiveXObject)
    {
      if(typeof uri== 'boolean'){
        iframeHtml += ' src="' + 'javascript:false' + '"';

      }
      else if(typeof uri== 'string'){
        iframeHtml += ' src="' + uri + '"';

      }
    }
    iframeHtml += ' />';
    jQuery(iframeHtml).appendTo(document.body);

    return jQuery('#' + frameId).get(0);
  },
  createUploadForm: function(id,fileElementId,data,fileElement)
  {
    //create form
    var formId = 'jUploadForm' + id;
    var fileId = 'jUploadFile' + id;
    var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
    if(data)
    {
      for(var i in data)
      {
        jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
      }
    }
    var oldElement;
    if(fileElement == null)
      oldElement = jQuery('#' + fileElementId);
    else
      oldElement = fileElement;

    var newElement = jQuery(oldElement).clone();
    jQuery(oldElement).attr('id', fileId);
    jQuery(oldElement).before(newElement);
    jQuery(oldElement).appendTo(form);

    //set attributes
    jQuery(form).css('position', 'absolute');
    jQuery(form).css('top', '-1200px');
    jQuery(form).css('left', '-1200px');
    jQuery(form).appendTo('body');
    return form;
  },

  ajaxFileUpload: function(s) {
    // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
    s = jQuery.extend({}, jQuery.ajaxSettings, s);
    var id = new Date().getTime();
    var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data),s.fileElement);
    var io = jQuery.createUploadIframe(id, s.secureuri);
    var frameId = 'jUploadFrame' + id;
    var formId = 'jUploadForm' + id;
    // Watch for a new set of requests
    if ( s.global && ! jQuery.active++ )
    {
      jQuery.event.trigger( "ajaxStart" );
    }
    var requestDone = false;
    // Create the request object
    var xml = {}
    if ( s.global )
      jQuery.event.trigger("ajaxSend", [xml, s]);
    // Wait for a response to come back
    var uploadCallback = function(isTimeout)
    {
      var io = document.getElementById(frameId);
      try
      {
        if(io.contentWindow)
        {
          xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
          xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;

        }else if(io.contentDocument)
        {
          xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
          xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
        }
      }catch(e)
      {
        jQuery.handleError(s, xml, null, e);
      }
      if ( xml || isTimeout == "timeout")
      {
        requestDone = true;
        var status;
        try {
          status = isTimeout != "timeout" ? "success" : "error";
          // Make sure that the request was successful or notmodified
          if ( status != "error" )
          {
            // process the data (runs the xml through httpData regardless of callback)
            var data = jQuery.uploadHttpData( xml, s.dataType );
            // If a local callback was specified, fire it and pass it the data
            if ( s.success )
              s.success( data, status );

            // Fire the global callback
            if( s.global )
              jQuery.event.trigger( "ajaxSuccess", [xml, s] );
          } else
            jQuery.handleError(s, xml, status);
        } catch(e)
        {
          status = "error";
          jQuery.handleError(s, xml, status, e);
        }

        // The request was completed
        if( s.global )
          jQuery.event.trigger( "ajaxComplete", [xml, s] );

        // Handle the global AJAX counter
        if ( s.global && ! --jQuery.active )
          jQuery.event.trigger( "ajaxStop" );

        // Process result
        if ( s.complete )
          s.complete(xml, status);

        jQuery(io).unbind()

        setTimeout(function()
        {	try
        {
          jQuery(io).remove();
          jQuery(form).remove();

        } catch(e)
        {
          jQuery.handleError(s, xml, null, e);
        }

        }, 100)

        xml = null

      }
    }
    // Timeout checker
    if ( s.timeout > 0 )
    {
      setTimeout(function(){
        // Check to see if the request is still happening
        if( !requestDone ) uploadCallback( "timeout" );
      }, s.timeout);
    }
    try
    {

      var form = jQuery('#' + formId);
      jQuery(form).attr('action', s.url);
      jQuery(form).attr('method', 'POST');
      jQuery(form).attr('target', frameId);
      if(form.encoding)
      {
        jQuery(form).attr('encoding', 'multipart/form-data');
      }
      else
      {
        jQuery(form).attr('enctype', 'multipart/form-data');
      }
      jQuery(form).submit();

    } catch(e)
    {
      jQuery.handleError(s, xml, null, e);
    }

    jQuery('#' + frameId).load(uploadCallback);
    return {abort: function(){
      try
      {
        jQuery('#' + frameId).remove();
        jQuery(form).remove();
      }
      catch(e){}
    }};
  },

  uploadHttpData: function( r, type ) {
    var data = !type;
    data = type == "xml" || data ? r.responseXML : r.responseText;

    // If the type is "script", eval it in global context
    if ( type == "script" )
      jQuery.globalEval( data );
    // Get the JavaScript object, if JSON is used.
    if ( type == "json" ){
      var reg=/<pre.*?>(.*?)<\/pre>/i;
      if(reg.test(data)){
        var am = reg.exec(data);
        data =am? am[1] : '';
      }
      data=jQuery.parseJSON(data);
    }
    // evaluate scripts within html
    if ( type == "html" )
      jQuery("<div>").html(data).evalScripts();

    return data;
  },

  handleError: function( s, xml, status, e ) {
    // If a local callback was specified, fire it
    if ( s.error )
      s.error( xml, status, e );

    // Fire the global callback
    if ( s.global )
      jQuery.event.trigger( "ajaxError", [xml, s, e] );
  }
});